Adjustable sieve for separators



D. E. HOFFMAN.

ADJUSTABLE SIEVEFOR SEPARATORS.

APPLICATION FILED OCT. 1.3.1919.

1,339,560. Patented May 11, 1920.

3 SHEETS-SHEET 2.

514mm hfoz D. E. HOFFMAN.

ADJUSTABLE SIEVE FOR SEPARATORS.

APPLICATION FILED OCT. 13, 1919.

1,339,560, I Patented 11, 1920.

3 S -SHEET 3.

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DANIEL .n. HOFFMAN, or rtfrrmourn, 0111c.

.ADJUSTABLE SIEVE FOR SEPARATORS.

To all whomit may concern Be it known that I, DANIEL E. HOFFMAN, a citizen of the United States-of America, residing at Plymouth, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Adjustable Sieves sfor Separators, of which the following is a specification.

This invention relates to improvements in adjustable sieves for separators.

The present invention broadly accomplishes the same objects and results as the type of sieve shown and described in applicants pending application filed on Oct. 22, 1918, Serial 259,176. It is created, constructed and designed, however, to attain the objects and accomplish the results in a more efficient, [economical and effective manner.

The specific improvements herein shown and described that differentiate from the invention shown in the pending application heretofore identified consist in providing wind deflectorsof lip formation which are preferably struck fromthe perforatedmemher at a predetermined angle with respect to said perforated 'member; said lips remaining at the same angle and position at any pointof the closure of the perforations by the adjustment of the closu-re means; to provide movable closure means for the :perforations in the perforated member comprising a series of parallel slats which are connected together in spaced relation to each other at their ends by angle bars; to

' provide a combined means of bracing the corners of the sieve frame and a bearing guide to maintain and 'hold the angle "bars in position to provide auxiliary braces for the sieve frame that are attached to the frame to aline with the ribs formed in con structing the perforated member through the medium of a series of sections, and to provide means of clamping the auxiliary braces and ribs together and in opposed relation to each other, thereby adding strength, rigidity and durability to the sieve structure. I 7

These and other objects are attained by mechanism illustrated in :the accompanying drawing in which:

Figure 1 is a :top plan view of the sieve showing it assembled with the perforations partially open.

Fig. 2 is an end view of Fig. '1.

Fig. 3 is a bottom plan view of the as- Specifieation of Letters Patent.

Patented May 11, 1920.

Application filedoctober '13, 1919. Serial No. 330,412.

sembled sieve showing the mesh partially open.

Fig. 4 is a section of the sieve on the line 4-14: of Fig. 3.

Fig. 5 is a section of the sieve takenlon the line 5+5 of Fig. 3.

Fig. 6 is a fragmentary perspective view of one corner of the seive showing the construction of the perforated :member and closure means upon an enlarged scale.

In the drawings reference numerals 1 and 2 represent the end frame bars of the sieve, and 3 and 4 the side bars of the frame of the sieve.

The perforated member comprises a plurality of sections 5, 6, and 7 which are connected together in a manner described in the pending application hereinbefore identified. The drawings show a conventional con struction of sieve using the three sections above identified, but .it is obvious towthose skilled in the art that more or less sections can be used as is foundmost .expedientand practical.

Referring now to Fig. '1 attention is called to the fact that the sections '5, 6 and 7 are fastened together leaving .the ribs 8 and 9 atthe points :of their connection and the-ends are fastened-to the end bars 1 and 2 by nails3' or-other similar fastening means. The side sections which in the conventional type shown in the drawings are numbered 5 and? are made of such a size as to overlap a portion of the sidebars 3 and i and they are also attachedin a similar manner 1 to the attachment of the ends of said section and are held in place and position'by the cleats 10 and 11. The sections as shown are provided preferably with rectangular perforations 12 which arearranged to aline witheachother in series. A series of parallel slats 13 equaling in number the seriesof perforations are arrangedto slide on the under surfaceofthe perforated member as perforated member. ably struck from the perforated member at a predetermined angle of inclination with respect to the perforated member. The

degree of said angle being determined by such angle that has been found by experience to be the proper degree of incidence with reference to the air blast to clean the grain or seed the most efficiently. The degree ordinarily found to be the most satisfactory is about 45.

In order to provide corner braces to strengthen the sieve frame and at the same time provide a bearing and guiding means for the sliding movement of theangle bars 14 and 15, the braces 18, 19, and 21 are provided and arranged at an angle across the corners of the sieve. The braces are arranged so as to lie in juxta-position to 20 and to permit the angle bars 14 and 15 to move over and contact with the braces which form guide bearings to hold said angle bars in their proper place when movement is imparted to them-for the purpose intended.

It will be noted that the. corner braces perform two functions that is,they brace the corners of the sieve frame and also form an inclosure to retain the angle bars in position that move the parallel slats in unison and they also keep the parallel slats in close contact with the bottom surface of the per forated member of the sieve.

It is well known to those who are skilled in the art that sieves for: separators are made in many instances "of large dimensions and that they should be made and are ordinarily made of sheet metal for lightness. The effect of this construction ordinarily results in sagging at the central portion of the same if some auxiliary means is not provided to prevent said sagging. In the present construction of sieve, therefore, the beads or. ribs 8 and-9 are provided at the connecting point of the sections which perform the function of braces "on one side of the perforated member. On the opposite side aplurality of braces 22 and 23 are provided with their ends L shape to fasten to .the end bars land 2 as shown in Fig. 3.

a The braces 22 and 23 are arranged to be fastened to the end bars 1 and 2' in alinement With, "opposed to the ribs or beads 8 and 9 and'located on the opposite side of the perforated member.

' The braces while bracing the frame at the same time provide guiding means and bearings to assist in holding the series of conneoted parallel slats in contact with the under-surface of the perforated member. In

order to further maintain the rigidity and strength of the sieve and secure the full effect of the ribs or-beads 8 and 9 and the auxiliary braces 22 andj23 clamping clips 24" and 25 are providedto hold said braces The lips are preferin close contact with each other and prevent any tendency to separate from each other during adjustment or operation.

In order to provide an efficient means for the adjustment of the series of parallel slats hereinbefore described a draw bar 26 is provided and connected to said series of parallel slats as shown in Fig. 3. Brackets 27 and 28 are fastened to the end bar 2 of the frame as shown in Fig. 3 and a rotatable shaft 29 is suitably journaled in bearings formed in said brackets. A plurality of cranks 30,31 and 32 are mounted on said rotatableshaft and securely fastened thereto by any well known fastening, means either by set screw, key way or the like.

Suitable apertures are provided in the angle bars 14 and 15 and in the draw bar 26 to receive the L shaped ends of the links 38, 34 and 35 and the opposite L shaped ends of the links are connected through the me dium of suitable apertures formed in the cranks to the cranks 30, 31 and 32 thereby connecting the series of movable slats at their ends and also to the central portion thereof so as to draw said parallel slats up for adjustment purposes parallel and uniform throughout their length.

The rotatable shaftx29 has an extended portion 36 projected beyond the crank 32 and its end is formed rectangular at 37 to receive a wrench by means of which the shaft 29 is rotated and when rotatedthe parallel slats are actuated to move to and fro slidably on the bottom surface of the perforated members thereby closing or opening the apertures 12 more or less to clean any size or kind of grain that the operator desires to clean.

Attention is called to the fact that the perforated members are stationary and do not move during the adjustment operation of the parallel slats to close the perforations 12 more or less for cleaning the size or kind of grain desired; 'hencethe struck-up lip portions thereof forming the wind blast always remain. at a constant angle and are never changed at any point of the adjustment of the movable parallel slats. This feature is important as is well known to expert thresh ermen, as in the ordinary type of adjustable sieve, when the size of the opening is changed for adjustment purposes to clean different kinds of seed or grain the angle of the wind blast is changed making it necessary to change the wind blast to some extent after the adjustment is made. The angle ofrelation to thewind blast is not changed in the present invention at any point of its adjustment. It is not necessary in the present invention to change the windfblast at any point of its adjustment for eflicient cleaning and separation of all kindsof grain or seed. To protect the adjusting mechanism an apron 38is provided. 5:

ciple of :the invention; hence it is not intended to confine ,the present invention to the structures-shown and described. The

method of-connectin and 'oinin the se arate sections such as 5,6 and 7 together is not claimed or described herein as it will be the subject matter of another application.

I claim: 1. Ina sieve for separators, a frame, a perforatedmember composed of a series of separate sections connected together, parallel slats slidably mounted thereunder in spaced apart relation, angle bars attached to said slats, means'connectedto the angle bars to actuate the parallel slats inunison to close or open the perforations in the perforated member more or less as desired.

2. In a sieve for separators, a perforated member composed of a plurality of connected sections, a plurality of parallel slats slidably mounted to move under said perforated member and means to actuate the parallel slats.

3. In a sieve, a perforated member, in combination with a plurality of slats of sheet metal having one edge thereof reduced inthickness with respect to the body portion and connected to move in unison under the perforated member to vary the openings therein.

4. In a sieve, a perforated member, in combination with a plurality of slats of sheet metal having one edge thereof reduced in thickness with respect to the body portion, means to connect said slats to move under the perforated member in unison to vary the openings therein, and means to actuate the slats in unison.

5. Ina sieve, a frame provided with ribs, a perforated member, a plurality of parallel. slats mounted thereunder, angle bars attached to the parallel slats, braces secured to the frame opposed and in alinement with the ribs of the perforated member, clamping clips to clamp the ribs and braces.

6. In a sieve, a frame provided with ribs. a perforated member, a plurality of parallel slats mounted thereunder, angle bars attached to the parallel slats, braces secured to the frame opposed and in alinement with the ribs of the perforated member, clamping clips to clamp the ribs and braces, and means connected to the angle bars to actuate the parallel slats to slide over the perforated member in unison.

7 In a sieve, a frame, corner braces for said frame, a perforated member, a plurality of parallel slats slidably mounted under said perforated member, angle irons .connectedto said parallel slats-and so locatedas to slide underneath saidcorner braces;

8. Ina sieve, a frame, corner braces for said'frame, a perforated member, a plurality of parallel slats slidably mounted under said perforated -member, angle irons connected to said parallel slats and so located as to slide underneath said corner braces, and means to actuate said parallel slats in unison.

9. In a sieve for separators, a frame, a member composed of a plurality of connected sections having lips struck-therefrom leaving a..se ries of openings, parallel slats mounted to move under said member and means to slidably actuate the parallel slats to close the opening more or less.

10. In 'a -sieve, a perforated member in combination with a closure means composed of sheet metal slats doubled unequally thereby leaving one edge projeotingbeyond the other-andmeans to connect said slats to move in unisonunder the perforated mcmber to varythe openings therein.

11. In a sieve, a perforated member in combination with a closure means composed of sheet metal doubled upon itself unequally thereby leaving one edge projecting beyond the other and means to operate the closure means, said closure means being adapted to move under the perforated member to vary the openings therein more or less as desired.

12. In a sieve comprising a meshed member composed of a plurality of connected sections, a series of connected slats and means to operate said slats over the under surface of the perforated member.

13. The combination in a sieve for separators of a perforated member composed of a plurality of connected sections, a frame therefor, a plurality of slats slidably mounted under the perforated member and means of connecting said slats for operation in unison.

14:. The combination in a sieve for separators, of a perforated member composed of a plurality of connected sections, a frame therefor, a plurality of slats slidably mounted under the perforated. member, means of connecting said slats for operation in unison and means of imparting a sliding movement to said plurality of slats in unison.

15. The combination in a sieve for separators, of a perforated member composed of a plurality of connected sections, a frame therefor, a plurality of slats slidably mounted under the perforated member, means of connecting said slats for operation In unison, means of imparting a sliding movement to said plurality of slats in unison and braces secured to the frame.

16. The combination in a sieve for separators of a perforated member, a frame therefor, a plurality of slats slidably mounted under the perforated member, means of connecting said slats for operation in unison, means of imparting a sliding movement to said plurality of slats in unison, braces secured to the frame and clips to clamp the braces to the perforated member.

17. A sieve comprising a member com posed of a plurality of connectedsections having lips struck therefrom leaving a plurality or series of openings, slats mounted under said perforated member and adapted to vary the openings in said perforated member when actuated.

18. A'sieve comprising a member composed of a plurality of connected sections having lips struck therefrom leaving a plurality or series of openings, slats mounted under said perforated member and adapted to vary the openings in said perforated member and means to actuate said slats.

19. A sieve for separators comprising a meshed member composed of a series of separate parts connected together to provide channels and having lips struck therefrom leaving openings, means to close said openings, braces for the perforated member and means to clamp the braceto the perforated the major portion of the slats of a prede-- termined thickness and a minor portion adj acent and contiguous with one edge of less thickness than the major portion of the slats, said slats being connected together to move in unison to cover or uncover the perforationsof the perforated member more or less.

21. In a sieve, a perforated member, in combination with a series of slats having the major portion of the slats of a predetermined thickness and a minor portion adjacent and contiguous with one edge of less thickness than the major portion of the slats, said slats being connected together to move in unison to cover or uncover the perforations of the perforated member moreor less.

and means to impart a reciprocating move ment to the slats as described and set forth. 

